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KB Details - KB5124008
KB5124008
Important
⚠️ Yes
Title
September 8, 2026—KB5124008 (OS Builds 26200.9445 and 26100.9445) | Microsoft Support
Severity
Important
Known Issues
⚠️ Yes
Known Issues Count
1
Update Type
Security
Release Date
2026-09-08
OS Builds
26200.9445, 26100.9445
Known Issues Details
#1 - N/A Status: N/A Symptoms: After installing the update, some Credential Guard protected machine accounts might lose their secure channel with an on-premises Active Directory domain. Users might be unable to sign in interactively with valid domain credentials. Workaround: N/A Affected: N/A
Description
[Security] Domain-joined devices might lose their secure trust relationship with the domain. After installing the update, some Credential Guard protected machine accounts might lose their secure channel with an on-premises Active Directory domain. Users might be unable to sign in interactively with valid domain credentials.